Schripp et. al. [1] measured the emission rates of propylene glycol from 3 e-cigarettes. A single
3-second puff was mechanically delivered into a 10 L glass chamber with a ventilation rate of 3
h-1. The concentrations of propylene glycol were measured using Tenax TA tubes and analyzed
by GC-MS. The mass of propylene glycol per puff was determined using a mass balance
analysis.